Help We have No Blooms!

My mother has Syberian Iris's She has divided them and moved them to
a sunnier spot. But they haven't bloomed in two years. There are even
some newer bulbs that haven't bloomed either. They show no signs of
disease at all. We live in Zone 5. I've searched every web page I can
and she's read all the books she has. So whatever helpful suggestions
we can get were taking.
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